countries

set_target_regions ( regions )

Makes a post only available to viewers in certain regions.

$post->set_target_regions( [6,53] );

regions

An array reference of region numbers however Facebook defines that. I've got no idea because their documentation sucks. I'm not even sure what a region is. Is it a region of a country? Of a continent? No idea. I do know it is an integer, but that's about it.